arch,cpu-minor: Make the uReset method virtual in PCStateBase.

This is used in the minor CPU, but maybe shouldn't. This makes it
accessible from a generic PCStatePtr without having to cast it to a
PCState subclass.

Change-Id: Ied89e2c9c69b1a7d647129fdade10312e21dcaa1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/52064
Tested-by: kokoro <noreply+kokoro@google.com>
Reviewed-by: ZHENGRONG WANG <seanyukigeek@gmail.com>
Maintainer: ZHENGRONG WANG <seanyukigeek@gmail.com>

src/arch/generic/pcstate.hh

@@ -120,6 +120,12 @@ class PCStateBase : public Serializable
         return _upc;
     }
 
+    virtual void
+    uReset()
+    {
+        _upc = 0;
+    }
+
     void
     serialize(CheckpointOut &cp) const override
     {
@@ -265,9 +271,9 @@ class PCStateCommon : public PCStateBase
 
     // Reset the macroop's upc without advancing the regular pc.
     void
-    uReset()
+    uReset() override
     {
-        _upc = 0;
+        PCStateBase::uReset();
         _nupc = 1;
     }
 

src/cpu/minor/fetch2.cc

@@ -447,7 +447,7 @@ Fetch2::evaluate()
                      * may be pointing to a microop other than 0.  Once
                      * advanced, however, the microop number *must* be 0
                      */
-                    fetch_info.pc->as<TheISA::PCState>().uReset();
+                    fetch_info.pc->uReset();
 
                     /* Advance PC for the next instruction */
                     decoded_inst->advancePC(*fetch_info.pc);